The visual indication of the drag.

	function OnGUI ()
	{
		var eventType = Event.current.type;
		if (eventType == EventType.DragUpdated || eventType == EventType.DragPerform)
		{
			// Show a copy icon on the drag
			DragAndDrop.visualMode = DragAndDropVisualMode.Copy;
			if (eventType == EventType.DragPerform)
				DragAndDrop.AcceptDrag();
			Event.current.Use();
		}
	}